Converting sound into an image via an eidophone

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In my earlier post Reconstructing sound from a silent video we saw a method of reconstructing audio by observing the minute variations of a surface's edge caused by sound vibrations. In this post we see images made by sound vibrations.

Megan Watts Hughes was a 19th Century Welsh singer and scientist. She developed a machine she called an Eidophone which allowed her to create graphic captures of her singing notes by disturbing particles on a membrane. Some of the pictures are very striking.

These are taken from the Public Domain Review's post Picturing a Voice. There are more examples at the link, as well as a discussion of her eidophone and other early attempts to visually capture sound.